<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>头像</title>
		<style type="text/css">
			#user{
				width: 250px;
				height: 250px;
				background-image: url(images/user.png);
				border-radius: 125px;
			}
		</style>
	</head>
	<body>
		<h3>利用css3样式对div进行圆角，最终实现圆</h3>
		<div id="user">
			
		</div>
		
	</body>
</html>
